package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.entity.User;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
//    /**
//     * 根据时间区间统计营业额
//     * @param begin
//     * @param end
//     * @return
//     */
//    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
//        List<LocalDate> dateList = new ArrayList<>();
//        dateList.add(begin);
//
//        while (!begin.equals(end)){
//            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
//            dateList.add(begin);
//        }
//
//        List<Double> turnoverList = new ArrayList<>();
//        for (LocalDate date : dateList) {
//            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
//            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
//            //查询营业额
//            Map map = new HashMap();
//            map.put("status", Orders.COMPLETED);
//            map.put("begin",beginTime);
//            map.put("end", endTime);
//            Double turnover = orderMapper.sumByMap(map);
//            turnover = turnover == null ? 0.0 : turnover;
//            turnoverList.add(turnover);
//        }
//
//        //数据封装
//        return TurnoverReportVO.builder()
//                .dateList(StringUtils.join(dateList,","))
//                .turnoverList(StringUtils.join(turnoverList,","))
//                .build();
//    }

    /**
     * 一次性，根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        List<Double> turnoverList = new ArrayList<>();

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        // 一次性查询所有符合条件的订单
        Map<String, Object> map = new HashMap<>();
        map.put("status", Orders.COMPLETED);
        map.put("begin", beginTime);
        map.put("end", endTime);
        List<Orders> ordersList = orderMapper.getByMap(map);

        // 按日期分组计算营业额
        Map<LocalDate, Double> turnoverMap = new HashMap<>();
        for (Orders order : ordersList) {
            LocalDate orderDate = order.getOrderTime().toLocalDate();
            turnoverMap.put(orderDate, turnoverMap.getOrDefault(orderDate, 0.0) + order.getAmount().doubleValue());
        }

        // 填充结果列表
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
            turnoverList.add(turnoverMap.getOrDefault(begin, 0.0));
        }

        // 数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

//    /**
//     * 根据时间区间统计用户数量
//     * @param begin
//     * @param end
//     * @return
//     */
//    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
//        List<LocalDate> dateList = new ArrayList<>();
//        dateList.add(begin);
//
//        while (!begin.equals(end)){
//            begin = begin.plusDays(1);
//            dateList.add(begin);
//        }
//
//        List<Integer> newUserList = new ArrayList<>(); //新增用户数
//        List<Integer> totalUserList = new ArrayList<>(); //总用户数
//
//        for (LocalDate date : dateList) {
//            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
//            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
//            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
//            Integer newUser = getUserCount(beginTime, endTime);
//            //总用户数量 select count(id) from user where  create_time < ?
//            Integer totalUser = getUserCount(null, endTime);
//
//            newUserList.add(newUser);
//            totalUserList.add(totalUser);
//        }
//
//        return UserReportVO.builder()
//                .dateList(StringUtils.join(dateList,","))
//                .newUserList(StringUtils.join(newUserList,","))
//                .totalUserList(StringUtils.join(totalUserList,","))
//                .build();
//    }
//
//    /**
//     * 根据时间区间统计用户数量
//     * @param beginTime
//     * @param endTime
//     * @return
//     */
//    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
//        Map map = new HashMap();
//        map.put("begin",beginTime);
//        map.put("end", endTime);
//        return userMapper.countByMap(map);
//    }

    /**
     * 获取从 begin 到 end 的日期列表
     * @param begin
     * @param end
     * @return
     */
    private List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        LocalDate currentDate = begin;
        while (!currentDate.isAfter(end)) {
            dateList.add(currentDate);
            currentDate = currentDate.plusDays(1);
        }
        return dateList;
    }

    /**
     * 一次性，根据时间区间统计用户数量
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 获取从 begin 到 end 的日期列表
        List<LocalDate> dateList = getDateList(begin, end);

        int size = dateList.size();
        int[] totalUserList = new int[size]; // 存放每天总用户数
        int[] newUserList = new int[size];   // 存放每天新增用户数

        // 查询 begin ~ end 时间段内的所有用户
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<User> userList = userMapper.getByBeginAndEndTime(beginTime, endTime);

        // 统计每天新增用户数
        for (User user : userList) {
            if (user.getCreateTime() != null) {
                LocalDate createTime = user.getCreateTime().toLocalDate();
                if (!createTime.isBefore(begin) && !createTime.isAfter(end)) {
                    int daysFromStart = (int) ChronoUnit.DAYS.between(begin, createTime);
                    if (daysFromStart >= 0 && daysFromStart < size) {
                        newUserList[daysFromStart]++;
                    }
                }
            }
        }

        // 查询 begin 之前的总用户数
        Map<String, Object> paramMap = new HashMap<>();
        paramMap.put("end", beginTime);
        Integer baseUserCount = userMapper.countByMap(paramMap);
        baseUserCount = baseUserCount == null ? 0 : baseUserCount;

        // 计算每天的累计总用户数
        totalUserList[0] = baseUserCount + newUserList[0];
        for (int i = 1; i < size; i++) {
            totalUserList[i] = totalUserList[i - 1] + newUserList[i];
        }

        // 转换为逗号分隔字符串
        String dateStr = StringUtils.join(dateList, ',');
        String newUserStr = StringUtils.join(newUserList, ',');
        String totalUserStr = StringUtils.join(totalUserList, ',');

        // 构建返回对象
        return UserReportVO.builder()
                .dateList(dateStr)
                .newUserList(newUserStr)
                .totalUserList(totalUserStr)
                .build();

    }






//    /**
//     * 根据时间区间统计订单数量
//     * @param begin
//     * @param end
//     * @return
//     */
//    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
//        List<LocalDate> dateList = new ArrayList<>();
//        dateList.add(begin);
//
//        while (!begin.equals(end)){
//            begin = begin.plusDays(1);
//            dateList.add(begin);
//        }
//
//        //每天订单总数集合
//        List<Integer> orderCountList = new ArrayList<>();
//        //每天有效订单数集合
//        List<Integer> validOrderCountList = new ArrayList<>();
//
//        for (LocalDate date : dateList) {
//            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
//            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
//            //查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
//            Integer orderCount = getOrderCount(beginTime, endTime, null);
//
//            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
//            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
//
//            orderCountList.add(orderCount);
//            validOrderCountList.add(validOrderCount);
//        }
//
//        //时间区间内的总订单数
//        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
//        //时间区间内的总有效订单数
//        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
//
//        //订单完成率
//        Double orderCompletionRate = 0.0;
//        if(totalOrderCount != 0){
//            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
//        }
//
//        return OrderReportVO.builder()
//                .dateList(StringUtils.join(dateList, ","))
//                .orderCountList(StringUtils.join(orderCountList, ","))
//                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
//                .totalOrderCount(totalOrderCount)
//                .validOrderCount(validOrderCount)
//                .orderCompletionRate(orderCompletionRate)
//                .build();
//    }
//
//    /**
//     * 根据时间区间统计指定状态的订单数量
//     * @param beginTime
//     * @param endTime
//     * @param status
//     * @return
//     */
//    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
//        Map map = new HashMap();
//        map.put("status", status);
//        map.put("begin",beginTime);
//        map.put("end", endTime);
//        return orderMapper.countByMap(map);
//    }

    /**
     * 根据时间区间统计订单数量
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 获取从 begin 到 end 的日期列表
        List<LocalDate> dateList = getDateList(begin, end);
        int size = dateList.size();
        int[] orderCountList = new int[size];       // 每天订单总数
        int[] validOrderCountList = new int[size];   // 每天有效订单数

        // 查询时间范围内的所有订单
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        Map<String, Object> map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        List<Orders> ordersList = orderMapper.getByMap(map);

        // 统计每天的订单数量和有效订单数量
        for (Orders order : ordersList) {
            LocalDate orderDate = order.getOrderTime().toLocalDate();
            if (!orderDate.isBefore(begin) && !orderDate.isAfter(end)) {
                int daysFromStart = (int) ChronoUnit.DAYS.between(begin, orderDate);
                if (daysFromStart >= 0 && daysFromStart < size) {
                    orderCountList[daysFromStart]++;
                    if (Orders.COMPLETED.equals(order.getStatus())) {
                        validOrderCountList[daysFromStart]++;
                    }
                }
            }
        }

        // 计算总订单数和完成率
        Integer totalOrderCount = Arrays.stream(orderCountList).sum();
        Integer validOrderCount = Arrays.stream(validOrderCountList).sum();
        Double orderCompletionRate = totalOrderCount == 0 ? 0.0 : validOrderCount.doubleValue() / totalOrderCount;

        // 转换为逗号分隔字符串
        String dateStr = StringUtils.join(dateList, ',');
        String orderCountStr = StringUtils.join(orderCountList, ',');
        String validOrderCountStr = StringUtils.join(validOrderCountList, ',');

        // 构建返回对象
        return OrderReportVO.builder()
                .dateList(dateStr)
                .orderCountList(orderCountStr)
                .validOrderCountList(validOrderCountStr)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }






    /**
     * 查询指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出近30天的运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));

        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);

            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue("时间："+begin + "至" + end);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }









}


